Abstract: In one aspect, a method for determining soil clods within a field includes receiving one or more images depicting an imaged portion of an agricultural field. The method also includes classifying a portion of the plurality of pixels that are associated with soil within the imaged portion of the field as soil pixels with each soil pixel being associated with a respective pixel height. The method also includes generating a first ray from a local maximum in a first direction and a second ray from the local maximum in a second direction that is perpendicular to the first ray until opposing endpoints are determined based on a detected edge condition. Lastly, the method includes determining whether a soil clod based at least in part the first ray or the second ray of the candidate soil clod.

Abstract: A system for controlling the operation of a row cleaning device of a seed-planting implement may include a row cleaning device, at least one row sensor, and a controller. The row cleaning device may move field materials away from a travel path of a component of a seed-planting implement, where the component is positioned aft of the row cleaning device along a direction of travel of the seed-planting implement. The at least one row sensor may generate data indicative of a composition of the field materials moved by the row cleaning device. The controller may be configured to receive the data from the at least one row sensor as the seed planting implement moves across the field, and to monitor the composition of the field materials moved by the row cleaning device based at least in part on the data received from the at least one row sensor.

Abstract: A self-propelled platform for monitoring field crop phenotype is provided. The monitoring platform includes a traveling and steering mechanism, wheel track and ground clearance adjustment devices, damping devices, and a case. The traveling and steering mechanism includes wheel side motors, wheels, and torque motors. The wheels are connected to respective upright posts of the platform through respective rigid independent suspensions. Each upright post is of sleeve structure and includes an upper sleeve and a lower sleeve. A corresponding damping device is connected between the upper sleeve and the lower sleeve. The wheel track and ground clearance adjustment devices are configured for adjusting the height of the case and the tracks between the wheels. The lower ends of the wheel track and ground clearance adjustment devices are rotatably connected to respective upright posts, and the upper ends are rotatably connected to the case.

Abstract: An agricultural implement can be used to engage a field. Such engagement can be in a number of ways, including, but not limited to, ground engaging, application, drilling, precision agriculture, spreading, spraying, broadcasting, or the like. A number of row units with the engaging tools are positioned along a toolbar extending transversely to the direction of travel. To more easily transport the implement, and to comply with transportation rules and regulations, the toolbar can be folded about wing sections. This can be in multiple directions, including rotationally forward, rotationally vertical, and translationally rearward, which reduces the width of the implement and also minimizes the longitudinal distance between a hitch connecting the implement to a tow vehicle and the transport wheels of the implement.

Abstract: A system for controlling the operation of a row cleaning device of a seed-planting implement may include a row cleaning device configured to adjust a surface cleanliness of a portion of a field, at least one row sensor, and a controller. The at least one row sensor may generate data indicative of a first surface cleanliness parameter within a worked area of the field positioned aft of the row cleaning device and a second surface cleanliness parameter within an unworked area of the field, the unworked area being outside of the worked area. The controller may be configured to receive the data indicative of the first and second surface cleanliness parameters from the at least one row sensor, and to determine an efficiency of the row cleaning device based at least in part on the first and second surface cleanliness parameters.

Abstract: A method for determining residue coverage of a field includes receiving, with a computing system, a captured image depicting an imaged portion of a field from one or more imaging devices. Furthermore, the method includes determining, with the computing system, an image gradient orientation at each of a plurality of pixels within the captured image. Additionally, the method includes determining, with the computing system, a plurality of image gradient orientation densities associated with the captured image based on the determined image gradient orientations. Moreover, the method includes determining, with the computing system, a residue coverage parameter associated with the imaged portion of the field based on the determined plurality of image gradient orientation densities.

Abstract: Systems and method for linearly displacing an object, such as a cutter or other component, in response to a rotation of a pivotable arm are disclosed. The systems and method encompass one or more actuators, such as hydraulic cylinders, to pivot a pivotable arm pivotable about an axis. A flexible component coupled to an end of the pivotable arm is displaced in response to the rotational motion of the pivotable arm. Movement of the flexible component in response to rotation of the pivotable arm is converted into linear motion via curved surface on which the flexible component rides. The pivotable arm is rotated in response to actuation of one or more actuators, such as one or more hydraulic cylinders, coupled to the pivotable arm.

Abstract: An electric vehicle includes a body frame, a seat disposed on the body frame, a wheel attached to the body frame to be driven by an electric motor, a battery to supply electric power to the electric motor via an inverter and an electrical component, a plate member placed inside a covered space with a top being covered and on which the inverter and the electrical component are mounted, and a guide supported by the body frame to drawably guide the plate member from a position inside the covered space to a position outside the covered space.

Abstract: A handle assembly can include a handle extending from a work portion of the power tool. The handle can include a handle member configured to be engaged by a user when operating the power tool and at least one elongated member extending between the work portion of the power tool and the handle member. A multi-position interface can be spaced apart from the handle member and define a plurality of engagement interfaces. An engagement element can be configured to move relative to the multi-position interface and be selectively engageable with the plurality of engagement interfaces. A user engageable interface can be configured to selectively move the engagement element into and out of engagement with the plurality of engagement interfaces. The handle assembly can be angularly repositionable between a plurality of angular orientations when the engagement element is not disposed within any of the plurality of engagement interfaces.

Abstract: An agricultural harvester includes a plurality of controllable subsystems and a forward-looking crop sensor that detects a characteristic of the crop in front of the harvester. The forward-looking sensor generates a first sensor signal indicative of the detected characteristic. The harvester further includes a component sensor that detects a characteristic of a component of the agricultural harvesting machine and generates a second sensor signal indicative of the detected characteristic. Adaptation logic receives the first and second sensor signals and determines a sensor conversion factor intermittently during operation of the agricultural harvester. Recommendation logic receives the conversion factor and generates a recommendation to change operation of a controllable subsystem, based in part on the calculated conversion factor and a value received from the forward-looking crop sensor. A control system controls the controllable subsystem based on the generated recommendation.

Abstract: A feederhouse assembly for an agricultural harvester includes a pitch frame adjacent the inlet end of a feederhouse and arranged to pivot relative to the feederhouse, and a hydraulic cylinder and a spring coupling the pitch frame to the feederhouse. A method of connecting a harvesting header to an agricultural harvester includes applying a spring force to a pitch frame adjacent an inlet end of a feederhouse, applying a hydraulic force cylinder to the pitch frame, balancing the hydraulic force and the spring force when the pitch frame is in an orientation corresponding to an orientation of the harvesting header, moving the agricultural harvester toward the harvesting header, and securing the harvesting header to the pitch frame. The spring force is oriented to rotate the pitch frame downward, and the hydraulic force is oriented to rotate the pitch frame upward.

Abstract: An agricultural harvester has a frame and a spout that is movably mounted relative to the frame. A spout actuator drives movement of the spout relative to the frame based on a spout actuator control signal. Harvesting functionality engages material from a field and delivers the material through an outlet end of the spout as the agricultural harvester moves through the field in a direction of travel. A turn identifier identifies a location of a turn forward of the agricultural harvester in the direction of travel and generates a turn location indicator indicative of the location of the turn. A speed detector detects a speed of the agricultural harvester and generates a speed indicator indicative of the detected speed.

Abstract: This disclosure relates to an arrangement of equipment with an implement which has a machine tool for a working operation selected from the group comprising maintenance of green areas, mulching, mowing, soil tillage, harvesting coarse fodder, harvesting cereal crops and spraying, and which has an active portion which can be moved in a working direction through a working region. The arrangement of equipment includes a blower for blowing small creatures out of a portion of the working region preceding the active portion of the machine tool in the working direction.

Abstract: The invention relates to a fodder distributor formed by: a propelled carriage comprising a first shredding surface in the rear part, in the direction of travel, with first propulsion means, and a second surface in the front part, for feeding bales to the first surface; a first mechanism for shredding parallelepiped bales, with a shaft having a first end connected to rotation means and longitudinal blades projecting radially from the shaft; second propulsion means on the second surface; and respective panels for providing additional bale support, which are positioned horizontally adjacent to the second surface and have means for moving the bales to said surface.

Abstract: A bale wrap includes a wrapping layer configured to wrap around a bale of agricultural product, such that a first portion of the wrapping layer overlaps a second portion of the wrapping layer. Additionally, the bale wrap includes an adhesive layer embedded on or in the wrapping layer and configured to be activated by an adhesive activation mechanism. Activation of the adhesive layer enables the adhesive layer to bond the first portion of the wrapping layer to the second portion of the wrapping layer.

Abstract: A handheld driving apparatus is provided for mowing or cutting an object. The driving apparatus comprises: a container, a lock member, a trigger lever, and an action unit. The container is configured to extend from a rear side where a user is located toward a front side where the object is located. The lock member is configured to move between a first position and a second position, a straight line connecting the first position and the second position extending in a direction in which the container extends or in a direction orthogonal to a direction in which the container extends. The trigger lever is configured to move between a third position and a fourth position, to be restricted from moving to the fourth position when the lock member is at the first position, and not to be restricted from moving to the fourth position when the lock member is at the second position.

Abstract: There are provided techniques for controlling horticultural light illuminating a crop or plant. There is provided a method that includes tracking integral indicators and/or external information representative of a growth parameter of the crop or plant, and adjusting the horticultural light based on the integral indicators and/or external information. There is also provided a system including a recipe module, a tracking module configured to track integral indicators, and a feedback loop configured to feed ongoing integral indicators to the recipe module, and, in response thereto, alter illumination instructions, thereby adjusting the lighting scenario to be transmitted to a horticultural lighting apparatus.

Abstract: A system for simulating and implementing lighting scenarios for driving a horticultural light source in accordance with illumination instructions.

Abstract: Luminescent greenhouse glazing structures are described wherein the glazing structures comprise: a glass pane for a greenhouse; and, one or more Eu2+ doped amorphous inorganic luminescent thin film layers provided over the glass pane, wherein the one or more Eu2+ doped amorphous inorganic luminescent layers comprise or consist essentially of the elements Al and/or Si and the elements O and/or N; and, wherein the Si concentration is selected between 0 and 45 at. %, the Al concentration between 0 and 50 at. %, the O concentration between 0 and 70 at. %, the N concentration between 0 and 60 at. % and the Eu2+ between 0.01 and 30 at. %.

Abstract: The invention provides an improved system and method for a self-contained portable greenhouse, comprising a sun-light deprivation curtain system, and with a structural arrangement that integrates the fluid (liquid and air) distribution and dispensing for such plant life-support systems as water supply and irrigation, hydroponics water, nutrient and aeration, CO2 dosing, fuel (for power generation), forced-air ventilation, whereby its associated system components are miniaturized to a scale amenable for low voltage direct-current power, which are housed within the structure. The invention also provides a system architecture wherein the electrical interface infrastructure for connecting with electricity-producing resources—such as solar panels or wind turbines—is integrated into the portable greenhouse, as is the internal electrical distribution and direct-digital control for the plant life-support systems.

Abstract: The invention relates to a system (10) for managing an agricultural open space (12), having: at least two guide rail arrangements (11) running parallel to one another; a processing device (24) supported on both guide rail arrangements (22) and being able to be moved along the guide rail arrangements (22); at least one solar panel arrangement (28) arranged above the guide rail arrangements (22) and the processing device (24).

Abstract: A spliced tree skirt is disclosed in the present invention, which is formed by connecting a plurality of tree skirt members to each other, and further includes a connecting assembly. The connecting assembly includes a first connecting member and a second connecting member. The tree skirt members each include a first surface and a second connecting member, and the first connecting member or the second connecting member is arranged on the first surface or the second surface, so as to form a tree skirt that is spliced by lapping end to end sequentially or fitting sequentially. The spliced tree skirt of the present invention is assembled from a plurality of tree skirt members of substantially the same size, which is small in size in a disassembled state, easy to package and transport, and has a good visual appearance and function after assembly.

Abstract: The present invention is a flexible container to house a root ball of a plant and method of using the same. The container comprises a fabric sack, a securing ring and draw string. The fabric sack has an enclosed base and an open top that is folded over forming a narrow tubular aperture. The sack is made of a fabric having a mesh that inhibits or interferes with the life cycle of pests that infect or attempt to infect the root ball of the plant. The securing ring has a central aperture able to receive the stalk of the plant, an outer edge having a groove, an inner edge and an opening extending from the outer edge to the inner edge. The draw string is fitted through the narrow tubular aperture of the sack to enable the sack to be closed about the securing ring's outer edge groove.

Abstract: Disclosed is a restoration material, a restoration method for abandoned ion-absorbed rare earth tailings area and use thereof, which belongs to the technical field of ecological restoration. The restore material for the abandoned ion-absorbed rare earth tailings area provided by the present disclosure comprises AM fungi and pioneer plants; the species of AM fungi is selected from one or more of G. intraradices, G. mosseae and P. occultum; the pioneer plants is selected from one or more of paspalum, ramie and awn.

Abstract: A sod harvester's stacking position can be dynamically adjusted to form vertically aligned stacks. More particularly, a sod harvester's control system can be configured to automatically adjust the stacking position as a stack is being formed based on a sensed orientation of the pallet. In this way, the control system can ensure that a slab of sod that is dropped from the stacking head will fall into the intended location on the stack regardless of the orientation of the pallet relative to the stacking head.

Abstract: A quantitative weed monitoring method guides the selection of weed prevention and control measures, and belongs to the field of plant protection. The method performs rapid and quantitative monitoring of weeds in a farmland in different farming modes in the whole growth period by using a four-level visual observation method in the seedling stage, a sampling method in the growth stage, a seven-level visual observation method in the mature stage, and a soil seed bank survey before planting, and implements a targeted weed control policy according to a quantitative index of the weeds, thereby achieving continuous prevention and control of the weeds. Through continuous monitoring, the occurrence rule and dynamic of the weeds can be determined, the weed prevention and control measures are implemented, and the usage frequency and amount of herbicides are reduced, so that the weed occurrence is controlled, and the planting costs and environmental pollution are reduced.

Abstract: An ornamental seed and plant system includes a growing system with a growing pot that supports a potted plant and that has tie-down connectors for securing cordage to restrain a plant branch in a desired position to increase plant yield. A lid with additional tie-down connectors can be attached to the growing pot, and enables additional flexibility and support in securing plant branches in desired positions. The seed and plant system also includes a vending system having a vending machine that enables a consumer to purchase goods subject to authorization restrictions. The vending machines includes an identification reader that scans and interprets a form of consumer identification to either allow or prohibit the consumer from obtaining the goods. The vending machine may be located in a storage containment structure that also houses other horticultural products, including the growing system.

Abstract: The invention is software comprised of algorithms and html web page design that provide users with actual on-sight analysis of soil composition, and proper irrigation instructions matching that soil type for various plant types and sizes. This educational online calculator provides methodology for acquiring soil composition type, and then requests a few simply inputs from the user. After initiating calculation, the calculator then reports two pages of irrigation (and planting) instructions as well as vital related information. The presence of this calculator on the cloud affords the user to inexpensively make use of the invention while actually present in the landscape where the plant is located. The educational aspects go further yet, as they include links to many gardening technical bulletins designed to help the user understand why they are being given the included recommendations and instructions.

Abstract: Aspects of the disclosure provide systems and methods for controlling the flow of water through zones of an ancillary span of an irrigation system to achieve optimal water distribution for each of a plurality of sections of a field-of-interest to be irrigated by the ancillary span. The disclosed systems and methods optimally turn control zones on and off to minimize the flow variability of water supplied to the ancillary span. The technology described herein runs a series of simulations to determine an optimal irrigation plan for the ancillary span. The instantaneous average flow at different points within a simulation may be calculated. The plurality of instantaneous average flows are used to determine a variance statistic for the plurality, which is used to determine the optimal plan.

Abstract: An integrated irrigation valve control device has a coil adapted to develop an electromagnetic flux sufficient to cause actuation of irrigation equipment. Control circuitry is electrically coupled to the coil to control the flux at the coil. A housing covers at least a portion of the coil and at least a portion of the control circuitry.

Abstract: Methods and apparatus for determining a plant health parameter based on a measured IR parameter of the plant are provided. If the measured plant health parameter indicates the plant is experiencing a stress condition, an alert can be provided and/or a control system can be activated to supply environmental elements such as water to the plant to ameliorate the stress condition.

Abstract: A controlled environment agriculture system maximizes high quality yield, plant or organism density, and life cycle productivity. A combined structure contains automated conveyance and more than two vertically stacked planes of horizontal track that plants traverse throughout their life cycle. Nutritional support, controlled lighting, controlled climate and air flow are managed at each plane and coordinated across all planes as a system for optimized life cycle productivity. Plant or organism growth carriers are conveyed and connected to multiple planes with controlled elevators that enable continuous movement of plants throughout their lifecycle from seedling to harvest in a serpentine, carousel, or straight path configuration. Plants enjoy a variety of controlled environmental conditions including lighting, airflow, CO2, temperature and humidity configured to their organism type and optimized by life cycle stage.

Abstract: The present invention relates to a reservoir cover for use with hydroponic, aeroponic, aquaponic or similar systems used to cultivate plant articles without soil medium. The reservoir cover containing and re-directing water, nutrients, and other liquids, intentionally or un-intentionally leaked by the system, back into a reservoir or water source the reservoir cover is positioned upon. Within hydroponic, aeroponic, aquaponic or similar systems the plant article is held within a plant growing unit positioned above the reservoir cover. As water is dispersed from within said systems gravity directs movement of water, nutrients, and other liquids to the reservoir cover of the present invention. As water, nutrients and other liquids are leaked or lost from the plant growing unit the reservoir cover is positioned such that water, nutrients and other liquids are not dispersed to an undesirable location, but rather are re-directed back in the original water source or reservoir.

Abstract: Cultivation systems including a cultivation substrate configured to retain and viably maintain spores and germinated spores are disclosed. The cultivation systems may include one or more of a nutrient phase, an adhesive, a bioactive agent, a liquid containing phase. The cultivation substrates may be patterned. The cultivation systems may specifically retain and viably retain specific spore types.

Abstract: Provided area male sterility maintainer line plant, a method for producing the male sterility maintainer line plant, and use of said plant for propagating a male sterility line plant and the male sterility maintainer line plant. In addition, a nucleic acid molecule, a vector, and a host cell for producing the male sterility maintainer line plant are provided.

Abstract: A plant comprising a genome having an introgression which comprises a polynucleotide sequence encoding a polypeptide having a terpene synthase activity or a transporter activity, the introgression comprising allelic variation(s) as compared to a genome of a recurrent parent of the plant, is disclosed. Organisms comprising a genome having been genetically modified to express a polypeptide having a terpene synthase activity or a transporter activity are also disclosed. Methods of modulating terpene synthesis or transport of metabolites in organisms, methods of producing plants having a terpene synthase activity of interest, having a terpene profile of interest or having a transporter activity of interest are disclosed. Methods of producing a terpene of interest are also disclosed.

Abstract: The present invention relates to methods and compositions for identifying, selecting and/or producing a disease resistant soybean plant or germplasm using markers, genes and chromosomal intervals derived from Glycine canescens P1440935, P1483193, P1595799, or a progeny thereof, or Glycine tomentella, or a progeny thereof. A soybean plant or germplasm that has been identified, selected and/or produced by any of the methods of the present invention is also provided. Disease resistant soybean seeds, plants and germplasms are also provided.

Abstract: The present invention relates to a method for preparation of soybean leaves having a high content of an isoflavone derivative in a dark condition and soybean leaves having a high content of an isoflavone derivative prepared thereby. Specifically, treatment of a soybean plant 20 days to 60 days after seeding with a predetermined concentration of ethylene in a dark condition was found to accumulate higher concentrations of isoflavone derivatives in soybean leaves than treatment with ethephon in a light condition, which requires a high level of energy. Therefore, when used, the method of the present invention can economically and quickly prepare soybean leaves having a very high content of isoflavones, and the soybean leaves having a high content of isoflavone derivatives, an extract of the soybean leaves, and a fraction of the extract can be advantageously used as a food and medicine material against diseases caused by estrogen unbalance and deficient antioxidant activity.

Abstract: The present invention relates to a Lactuca sativa seed designated 41-CO1332 RZ. The present invention also relates to a Lactuca sativa plant produced by growing the 41-CO1332 RZ seed. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 41-CO1332 RZ.

Abstract: The present invention relates to day-length neutral Cannabis plants with one or more value phenotypes.

Abstract: The unique annual herbaceous Cannabis plant variety ‘LPA004’ is provided.

Abstract: A novel hybrid squash plant, designated PASSION is disclosed. The disclosure relates to the seeds of hybrid squash designated PASSION, to the plants and plant parts of hybrid squash designated PASSION, and to methods for producing a squash plant by crossing the hybrid squash PASSION with itself or another squash plant.

Abstract: A novel hybrid squash plant, designated YELLOW QUEEN is disclosed. The disclosure relates to the seeds of hybrid squash designated YELLOW QUEEN, to the plants and plant parts of hybrid squash designated YELLOW QUEEN, and to methods for producing a squash plant by crossing the hybrid squash YELLOW QUEEN with itself or another squash plant.

Abstract: A multifoliate soybean cultivar designated P-17 is disclosed. The invention relates to the seeds of soybean cultivar P-17, to the plants of soybean cultivar P-17, to the plant parts of soybean cultivar P-17, and to methods for producing progeny of soybean cultivar P-17. The invention also relates to methods for producing a soybean plant containing in its genetic material one or more transgenes and to the transgenic soybean plants and plant parts produced by those methods. The invention also relates to soybean cultivars or breeding cultivars, and plant parts derived from soybean cultivar P-17. The invention also relates to methods for producing other soybean cultivars, lines, or plant parts derived from soybean cultivar P-17, and to the soybean plants, varieties, and their parts derived from use of those methods. The invention further relates to hybrid soybean seeds, plants, and plant parts produced by crossing cultivar P-17 with another soybean cultivar.

Abstract: The disclosure relates to a cotton variety, designated 11PWZS72, the plants and seeds of the cotton variety 11PWZS72, methods for producing a cotton plant, either varietal or hybrid, produced by crossing the cotton variety 11PWZS72 with itself or with another cotton plant, hybrid cotton seeds and plants produced by crossing the variety 11PWZS72 with another cotton variety or plan, methods for producing a cotton plant containing in its genetic material one or more transgenes, and the transgenic cotton plants produced by that method. This disclosure also relates to cotton varieties derived from cotton variety 11PWZS72, to methods for producing other cotton varieties derived from cotton variety 11PWZS72, and to the varieties derived by the use of those methods.

Abstract: An animal toilet (1) has: a main body (10) provided with a urine passing section (12); and a tray (20) on which an absorbent body (200) for absorbing urine passing through the urine passing section (12) is disposed. In a lower end portion on one side in the front-rear direction of the main body (10), an opening (19) for accommodating the tray (10) is formed. In the left-right direction, the length of the opening (19) is longer than the length of the tray (20). In a state where the tray (20) is accommodated in the main body (10), both a bottom section (15d) of the main body and a bottom section (27) of the tray are grounded.

Abstract: The present invention relates to a rain and sun shield device for pet crates/cages that prevents rainwater from accumulating inside the crates. More specifically, the rain and sun shield device includes multiple lip structures designed to be mounted on the top surface of the crate, such that the lip structures deflect any rainwater pouring over the crate and prevent any rainwater from entering inside the crate. The rain and sun shield device can be retrofitted to existing animal crate/cage designs or incorporated into the manufacturing of new models to provide protection against rainwater and sunlight. The device protects pets from the elements while being kept in a crate or cage placed in outdoor settings or while being transported in the bed of a pickup truck. The device ensures that pets remain safe, shaded, and dry.

Abstract: The exemplary embodiments provide an animal storage and transportation device comprising an upper enclosure having a floor, a set of supports which elevate the upper enclosure above a horizontal surface, and a primary hole placed within the floor. The device preferably includes a connection assembly positioned within the primary hole and attached to the floor, a transport container removably connected to the connection assembly, and an aperture closing mechanism positioned underneath the primary hole which is adapted to open an aperture which allows one or more small animals within the upper enclosure to be gravity fed into the transport container.

Abstract: Disclosed is an enclosure for animal husbandry, for example for dairy cattle, including a milking area preceded by a holding area. The holding area is covered by a floor covering that is made from a material capable of undergoing elastic deformation and that includes a sloping top face intended as a support surface for the animals. The floor covering includes a system of pipes provided with several outlet openings that open at top face of the floor covering; and the enclosure includes a circulator connected to the system of pipes, for conveying a treatment liquid inside the system of pipes and for causing the treatment liquid to flow through the outlet openings.

Abstract: A pet toy comprising a first member and a second member; wherein the first member and the second member are releasably connectable via a releasable positive mechanical engagement; wherein the first member has a bulbous end and an elongated projection extending from the bulbous end; wherein the second member has a bulbous end, an elongated tubular member extending from the bulbous end, and a passage, defined by a passage wall, within the elongated tubular member and the bulbous end; wherein the elongated projection of the first member is insertable into the passage of the second member and removable from the passage of the second member; wherein the elongated projection provides a first connector; wherein the passage wall provides a second connector; and wherein the releasable positive mechanical engagement formable by the first member and the second member is formable by the first connector and the second connector.